pierson



2 Sheets-Sheet 1..

(No Model.)

0. G. PIERSON. TRUSS FRAME FOB. LADDERS.

Patented Nov. 6, 1888.

ATTORNEY,

rapher, Washington. DLC

(No Model.) 2 Sheets-Sheet 2.

G. G. PIER'SON.

muss FRAME FOB. LADDERS; No. 392,361. wg Patented Nov. 6, 1888.

WITNESSES: Wyn/rah.

, Arron/m.

UNITED STATES PATENT OFFICE.

CALEB O. PIERSON, OF ELIZABETH, NEW JERSEY.

TRUSS-FRAM E FOR LADDERS.

SPECIFICATION forming part of Letters Patent No. 392,361, dated November 6, 1888.

Application filed March 31, 1888.

To aZZ whom it may concern:

Be it known that I. CALEB G. PIERSON, of Elizabeth, in the county of Union and State of New Jersey,haveinventeda new and Improved Truss-Frame for Ladders, of which the following is a full, clear, and exact description.

My invention consists,principally,ofa trussframe to be applied to ladders, whereby the same may be conveniently and safely used for IO a scaffold.

The invention also consists of the construction, arrangement, and, combination of parts, all as hereinafter described and claimed.

Reference is to be had to the accompanying [5 drawings, forming apart of this specification, in which similar letters of reference indicate ..-corresponding parts in all the figures.

Figure 1 is a perspective view of my invention applied to a ladder, the same being shown 2': as upheld from ropes by means of triangles.

Fig. 2 is an enlarged transverse sectional elevation on the line as a, Fig. 1; and Fig. 3 is an enlarged perspective view of one end of one of the lower cross-bars of one of the truss-frames.

A represents a ladder,shown in position for use as a scaffold, being supported from the ropes R R by the triangles B B.

C G are truss-frames applied to the under side of the ladder. These frames are duplicates of each other, each being composed of two uprights, a a, lower cross-bar, b, inter mediate crossbars, c c, and side braces, d d. The upper ends of the uprights ac are notched at a a to fit upon the rung of the ladder. as 3 5 shown clearly in Fig. 2. The cross-bar b is longer than the width ofthe ladder, and is providedat each end with a roller, 6, adapted to run in contact with the side of the house to swing the ladder away from contact with the house.

D D are iron rods formed with hooks d and connected to the center of the cross-bar b by an eyebolt, (1, upon the outer screw -threaded end of which is placed a nut, d, by which the Serial No. 269,109. (No model.)

rods may be drawn downward after being hooked upon the rungs of the ladder, as illustrated in Fig. 1, to firmly lock the truss-frames in contact with the rungs of the ladder.

The ladder is stiffened by the two ropes E E, attached at each end by hooks ff to the rungs of the ladderand passed through the openings or slots g g at the ends of the cross-bars b, as shown clearly in the drawings.

When the truss-frames and the ropes E are applied to the ladder as shown, the same is made very stiff, so that it can be safely and conveniently used as a scaffold, and the said frames and ropes may be very quickly and easily applied and as easily detached.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isr 1. The frame 0, formed with the uprights a, suitably held together and braced, and the cross-bar b, projecting beyond the uprights a, in combination with the rods D,ad i ustably at tached to the center of the cross-bar b, substantially as described.

2. The uprights a a, notched to engage with the rung of a ladder, the rodsD D, and crossbar I), projecting past the said uprights and provided with the rollers e, substantially as described.

3. .Theuprights a a, notched to engage with the rungs of the ladder, the rods D D, and the cross-bar b, notched at g to receive the ropes E, substantially as described.

4. The two frames 0, applied to the ladder and held by the rods D D, in combination with the ropes E E, attached at their ends to the rungs of the ladder and connected to the ends of the cross-bars b b of frame 0, substantially as described.

CALEB C. PIERSON.

Witnesses:

H. A. \VEsT, O. SEnGwroK. 

